I have a new 2008 R2 server ready to install exchange. I am installing two exchange 2010 servers. Can I clone the VM and use one for each exchange install? Further, the exchange servers will both be multi-role (CAS/HT/MBX), so could I install exchange then clone so I don't have to install it twice? If that is possible, what are the caveats I need to be aware of before putting them into production?